How does JS mark the text of buy and sell signals on the K line, for example: buy open, sell low

Author: xionglonghui, Created: 2021-09-15 14:24:32, Updated:

I would like to mark a buy and sell signal on K-line, how do I do it? Especially during retesting, it is convenient for you to clearly see the buy and sell signal, and then write a filter and filter out part of it.

I don't see the API for the diagram in the API documentation.


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